Thread: Overloaded >>

What you return is a reference to an istream (naturally), before you return you set the failbit to indicate that you could not read a new record, and eofbit to indicate that you cannot read another record because you have read them all.

Code:

std::istream &operator>>(std::istream &stream, PCB &pcb)
    PCB temp;

    stream >> temp.pid;
    if(temp.pid == -1) {
        stream.setstate(std::ios_base::failbit | std::ios_base::eofbit);
        return stream;
    }
    stream >> temp.arrival_time;
    stream >> temp.last_cpu_burst;
    stream >> temp.test_cpu_burst;
    stream >> temp.priority;
    stream >> temp.state_status;
    getline(stream,temp.hook);
    if(stream) pcb.swap(temp);
    return stream;
}

This assumes that PCB uses a std::string for it's hook, otherwise you have a memory leak in your previous code. This also obeys the convention that I always use that all >> operations leave thier targets unchanged. swap() is a new member that makes this and many other things much easier.